$39.$ Which factor does NOT affect the degree of separation in a distillation column?

$-$ A$)$ Column pressure

$-$ B$)$ Feed composition

$-$ C$)$ Column height

$-$ D$)$ Color of the crude oil

$40.$ The ASTM distillation test is significant for petroleum products because it:

$-$ A$)$ Identifies potential environmental hazards.

$-$ B$)$ Determines the temperature range over which a petroleum product will vaporize.

$-$ C$)$ Measures the product's resistance to chemical reactions.

$-$ D$)$ Assesses the product's suitability for blending with biofuels.

$41.$ In the classification of crude oil, sulfur content is important because:

$-$ A$)$ It determines the oil's viscosity.

$-$ B$)$ It affects the oil's color and appearance.

$-$ C$)$ High sulfur content can lead to corrosion in refinery equipment and increased environmental pollution.

$-$ D$)$ It significantly alters the boiling point of the oil.

$42.$ What is the primary goal of stabilization in crude oil processing?

$-$ A$)$ To increase the oil's sulfur content.

$-$ B$)$ To remove light hydrocarbons to reduce volatility.

$-$ C$)$ To decrease the oil's viscosity for easier transportation.

$-$ D$)$ To enhance the oil's color and transparency.